we are tyco integrated security. and we are sharper. . >>> moments after the twin blast was horrific, with the bombs define zooined to do maximum damage, and there were incredible efforts to help the wounded. dr. sanjay going joins us live in boston. i know you've been there for a couple days. it does seem to be bordering on minister rack louse this only three people have died in this. sol was injuries were so appalling, we assumed the death toll would rise quite significantly. >> reporter: yeah, and i think those miracles come in the form of some good planning and a little bit offer is ren dipty. remember at the end of the race, any marathon, they have a lot of medical capabilities on stand by. ambulances, medical triage tents, to be fair, what they're expecting to see is people who are dehydrated, an occasional person with difficulties with their heart, nothing like this. but these are medically trained professionals. several things happened, first of all, doctors and nurses and first responders were immediately ab